US3133940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the separation of delta-1, 4-3-keto steroid compounds from mixtures thereof with other 3-keto steroids
Assignee: Glaxo Group Ltd
•
Filing: 1956-04-16
•
Granted: 1964-05-19
•
Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Oughton John Francis
- 👤 Stephenson Leslie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:15
CPC Classifications
C; C07; C07J; C07J5/00; C07J75/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
13 words
A PROCESS FOR THE SEPARATION OF A A**1:4-C-KETO STEROID HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
13 words
A PROCESS FOR THE SEPARATION OF A A**1:4-C-KETO STEROID HAVING THE GENERAL FORMULA
References Cited (Backward Citations)
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Cited
US2773076A
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US2579479A
Cited
US2769020A
Cited
US2694079A
Cited
US2708673A
Cited
US2749356A
Cited
US2768191A
Cited
US2814630A
Cited
US2837541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-19 | 1967-11-18 | 1968-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-19 | 1971-11-18 | 1972-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-19 | 1975-11-18 | 1976-05-19 | $7700.00 | Window Closed / Lapsed |